Bent-tube boiler



BENT' TUBE BOILER Filed March 21, 1929 2 Sheets-Sheet 1 4. 52 2 BWW/M ATTORNEYS Dec. 30, 1930. J. MARSHALL BENT TUBE BOILER 2 Sheets-Sheet 2 Filed March 21, 1929 @QQQGQ 0 Q @QQQQ QQQQOQQ Q OGOGO INVENTOR VMJ ATTORNEY5 Patented Dec. 30, 1930 UNITED STATES PATENT OFFICE LEONARD J. MARSHALL, OF WESTWOOD, NEW JERSEY, ASSIGNOR TO INTERNATIONAL COMBUSTION ENGINEERING CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE BENT-TUBE BOILER Application filed March 21, 1929. Serial No. 348,807.

This invention relates to bent tube boilers such, for example, as a Stirling boiler having upper steamand water drums and a lower mud drum.

One of the primary objects of the invention is to provide a boiler of this type which may be operated at high rateswithout encountering difliculties with wet steam.

Another object of the invention is to provide a boiler of this type which can be 0perated under relatively high pressure, but in which relatively large thin-walled, and, therefore, relatively, inexpensive steam and water drums may be employed.

More specifically, it is an object to provide a boiler of this type in which relatively large, riveted steam and water drums may be employed.

My invention also contemplates a novel arrangement for connecting the tubes whereby ample ligaments may be provided.

How the foregoing, together with such other objects. and advantages as may hereinafter appear, or are incident to the invention, are realized is illustrated in the accompanying drawings, Wherein Fig. 1 is a vertical section through a boiler embodying my improvements.

Fig. 2 is a section on the line 2-2 for the purpose of illustrating the tube arrangement,

and

Fig. 3 is a fragmentary View on an enlarged scale illustrating the development of one of the steam and water drums.

Referring now to the drawings, the reference numeral 7 indicates the mud drum and the reference numerals 8 and 9 the upper steam and water drums. The steam and water drums and mud drum are connected by three banksof tubes A,.B and C.

The front bank A, horizontally considered, preferably consists of rows of tubes 1011, 10-11, etc. across the width of the bank, each row being preferably five tubes deep, with the tubes in each row in alignment with one another. The tubes of the rows 10 are expanded into the drum 8 in a region above the region at which the tubes of the rows 11 are expanded into such drum.

The bank B is similarly composed of rows 12-13, 1213 across the width of the boiler, these rows being preferably six tubes deep. The first three tubes 13a of each row 13 are connected to the steam and mud drum 8 and the last three tubes 136 are bent rearwardly and upwardly for connection with the steam and water drum 9.

The first four tubes 12a of each of the rows 12 are bent slightly to the rear at the top for connection with the steam and water drum 8 in a region to the rear of the region at which the tubes 13a are connected.

The last two rows 12b of each row 12 are bent rearwardly and upwardly for connection with the steam drum 9 in a region below the region at which thetubes, 136 are connected thereto. The water circulators 14 connecting the two drums 8 and 9 are connected to the respective drums in a region to one side of the region at which the tubes 12a are con- P nected, and in a region to one side of the regionat which the tubes 13?) are connected.

The tubesv of the bank O are arranged in aligned rows 15 and 16, each row being preferably five tubes deep. The tubes of the rows 15 are bent forwardly and upwardly for connection with the steam and water drum 9 in a region to one side of the region at which the tubes of the rows 16 are connected to said drum.

Steam circulators 17 are provided between the two drums.

Itwill be seen from the foregoing arrangement that ample ligaments are provided for all of the tubes connected to the drums 8 and 9, in consequence of which I am enabled to use large steam and water drums and to make them of relatively thin walled construction. I-may also employ a riveted drum construction for these steam and water drums, even though relatively high pressures are employed, say, for example, 600 pounds or thereabout. By the ability to employ large thin-walled drums the construction is less expensive than would otherwise be the case, and, addition, the large drums will afford not only a large reservoir for water, thereby securing adequate water supply, but also large steam releasing surfaces with correspondingly large steam space above the wate' line.

There is, thus, the efiective steam release and a minimizing of dill'iculties in connect with wet steam.

The arrangement is also one in which broper water levels will he 1. ined in two steam and water dru.

In the arrangenient show steam and vater drums are approximate f inches in diameter and the hind drum inches in diameter. The walls of the steam and mud drums are 2 inches thick.

The steam is preteraf" taken from the rear steam and water drum.

I claim 1. In conihii'iation, a bent tube boiler ha";- ing a plurality of relatively large thin walled steam and water 1 .nns, mud drum, and connecting banks of tubes, each bank consisting of nonstagg'ered tubes, every alternate row of the first hank hen w connected to the first steam and water drinn in a different region than the other rows circumferentially of the drum, and every row of the second bank havir part of i..' tubes con nected with the firs and part w n the second steam and water drum but with alternate rows connected to said drums at difi'er nt regions circumi erentiallv from other ro. thereof, and the alternate rows of the th r. hank being connected with the second drnzn at regions circunrlerentially diu'erent from the other rows thereof.

2. In combination, a bent tube boiler having a pluralit oi relatively large thin walled steam and water drums, a mud drum, and connecting banks of tubes, each bank con sisting of non-staggered tubes, every alternate row of the first bank being connected to the first steam and water drum in a dif Ferent region than the other rows circumferentially of the drum, and every row of the second bank having part of its tubes connectcd with the first and part with the second steam and water drum but with alternate rows connected to said drums at different regions circumferentially from the other rows thereof, and the alternate rows of the third bank being connected with the second drum at regions circumferentially different from the other rows thereof, together with Water circulation tubes between the steam and water drums connected thereto in re gions above those at which boiler tubes are connected thereto.

3. In combination, a bent tube boiler having a plurality of relatively large thin walled steam and Water drums, a mud drum, and connecting; banks of tubes, each bank consisting of non-staggered tubes, every alternate row of the first bank being connected to the first steam and water drum in a different region than the other rows circumferentially of the drum, and every row of the second bank having part of its tubes connected with the first and part with the second steam and water drum, but with alternate ro vs connected to said drums at dif- .nuzd drum a front bank of tubes conn-ctinc 7 o the mud drum with the first steam and water drum, a eccnd bank c sting oi non-stagbes every row of which has part of nectec with the first and part second steam and water drum but late rows connected to said drums at dirercnt regions circumferentially from the other rows thereof, and a third bank of tubes connectin the mud drum with the second drum.

In em nation, a bent tube boiler having a pun-aid of steam and water drums, a d ain. and connecting" banks of tubes including a second banl' every row of which has part of its tubes connected with the first and part with the second steam and water drum but with alternate rows connected to said drums at different regions circumferrntially from the other rows thereof.

6. In combination a bent tube boiler having a plurality of steam and water drums, a mud drum, and connecting banks of tubes including a second bank every row of which has part of its tubes connected with the first and part with the second steam and Water drum but with alternate rows connected to said drums at different regions circumferentially from the other rows thereof, and the tubes of the remaining banks being connected into the first and second steam and water drums at regions circumferentially different from the regions at which the tubes of the second bank connect.

In testimony whereof I have hereunto signed my name.

LEONARD J. MARSHALL. 

